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xlwt has various licenses that apply to the different parts of it, they are
listed below:

The license for the work John Machin has done since xlwt was created::

    Portions copyright (c) 2007, Stephen John Machin, Lingfo Pty Ltd
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice,
    this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation
    and/or other materials provided with the distribution.

    3. None of the names of Stephen John Machin, Lingfo Pty Ltd and any
    contributors may be used to endorse or promote products derived from this
    software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
    THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
    THE POSSIBILITY OF SUCH DAMAGE.

The licensing for the unit tests added as part of the work for Python 3
compatibility is as follows::

  Author:  mozman --&lt;mozman@gmx.at>
  Purpose: test_mini
  Created: 03.12.2010
  Copyright (C) 2010, Manfred Moitzi
  License: BSD licence

The license for pyExcelerator, from which xlwt was forked::

      Copyright (C) 2005 Roman V. Kiseliov
      All rights reserved.

      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions
      are met:

      1. Redistributions of source code must retain the above copyright
         notice, this list of conditions and the following disclaimer.

      2. Redistributions in binary form must reproduce the above copyright
         notice, this list of conditions and the following disclaimer in
         the documentation and/or other materials provided with the
         distribution.

      3. All advertising materials mentioning features or use of this
         software must display the following acknowledgment:
         "This product includes software developed by
          Roman V. Kiseliov &lt;roman@kiseliov.ru>."

      4. Redistributions of any form whatsoever must retain the following
         acknowledgment:
         "This product includes software developed by
          Roman V. Kiseliov &lt;roman@kiseliov.ru>."

      THIS SOFTWARE IS PROVIDED BY Roman V. Kiseliov ``AS IS'' AND ANY
      EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
      PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL Roman V. Kiseliov OR
      ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
      NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
      LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
      STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
      OF THE POSSIBILITY OF SUCH DAMAGE.

    Roman V. Kiseliov
    Russia
    Kursk
    Libknecht St., 4

    +7(0712)56-09-83

    &lt;roman@kiseliov.ru>

Portions of xlwt.Utils are based on pyXLWriter which is licensed as follows::

 Copyright (c) 2004 Evgeny Filatov &lt;fufff@users.sourceforge.net>
 Copyright (c) 2002-2004 John McNamara (Perl Spreadsheet::WriteExcel)

 This library is free software; you can redistribute it and/or modify it
 under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; either version 2.1 of the License, or
 (at your option) any later version.

 This library is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
 General Public License for more details:

 https://www.gnu.org/licenses/lgpl.html

pyXLWriter also makes reference to the PERL Spreadsheet::WriteExcel as follows::

  This module was written/ported from PERL Spreadsheet::WriteExcel module
  The author of the PERL Spreadsheet::WriteExcel module is John McNamara
  &lt;jmcnamara@cpan.org>
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